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   难度：Easy
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   <h1 class="question_title">
    83. Remove Duplicates from Sorted List
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   <p>
    Given a sorted linked list, delete all duplicates such that each element appear only
    <em>
     once
    </em>
    .
   </p>
   <p>
    <strong>
     Example 1:
    </strong>
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   <pre>
<strong>Input:</strong> 1-&gt;1-&gt;2
<strong>Output:</strong> 1-&gt;2
</pre>
   <p>
    <strong>
     Example 2:
    </strong>
   </p>
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<strong>Input:</strong> 1-&gt;1-&gt;2-&gt;3-&gt;3
<strong>Output:</strong> 1-&gt;2-&gt;3
</pre>
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    83. 删除排序链表中的重复元素
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   <p>
    给定一个排序链表，删除所有重复的元素，使得每个元素只出现一次。
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   <p>
    <strong>
     示例&nbsp;1:
    </strong>
   </p>
   <pre><strong>输入:</strong> 1-&gt;1-&gt;2
<strong>输出:</strong> 1-&gt;2
</pre>
   <p>
    <strong>
     示例&nbsp;2:
    </strong>
   </p>
   <pre><strong>输入:</strong> 1-&gt;1-&gt;2-&gt;3-&gt;3
<strong>输出:</strong> 1-&gt;2-&gt;3</pre>
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